/* -*- Mode: C; c-basic-offset:4 ; indent-tabs-mode:nil ; -*- */

/*

 *  (C) 2001 by Argonne National Laboratory.

 *      See COPYRIGHT in top-level directory.

 */

#include "mpi.h"

#include <stdio.h>

#include <string.h>

#include <stdlib.h>

#include "mpitest.h"

/*

static char MTEST_Descrip[] = "Test asynchronous I/O w/ multiple completion";

*/

#define SIZE (65536)

#define NUMOPS 10

/* Uses asynchronous I/O. Each process writes to separate files and

   reads them back. The file name is taken as a command-line argument,

   and the process rank is appended to it.*/

int main(int argc, char **argv)

{

    int *buf, i, rank, nints, len;

    char *filename, *tmp;

    int errs = 0;

    MPI_File fh;

    MPI_Status statuses[NUMOPS];

    MPI_Request requests[NUMOPS];

    MTest_Init(&argc, &argv);

    MPI_Comm_rank(MPI_COMM_WORLD, &rank;;

/* process 0 takes the file name as a command-line argument and

   broadcasts it to other processes */

    if (!rank) {

        i = 1;

        while ((i < argc) && strcmp("-fname", *argv)) {

            i++;

            argv++;

        }

        if (i >= argc) {

            /* Use a default filename of testfile */

            len = 8;

            filename = (char *) malloc(len + 10);

            memset(filename, 0, (len + 10) * sizeof(char));

            strcpy(filename, "testfile");

            /*

             * fprintf(stderr, "\n*#  Usage: async_any -fname filename\n\n");

             * MPI_Abort(MPI_COMM_WORLD, 1);

             */

        }

        else {

            argv++;

            len = (int) strlen(*argv);

            filename = (char *) malloc(len + 10);

            MTEST_VG_MEM_INIT(filename, (len + 10) * sizeof(char));

            strcpy(filename, *argv);

        }

        MPI_Bcast(&len, 1, MPI_INT, 0, MPI_COMM_WORLD);

        MPI_Bcast(filename, len + 10, MPI_CHAR, 0, MPI_COMM_WORLD);

    }

    else {

        MPI_Bcast(&len, 1, MPI_INT, 0, MPI_COMM_WORLD);

        filename = (char *) malloc(len + 10);

        MTEST_VG_MEM_INIT(filename, (len + 10) * sizeof(char));

        MPI_Bcast(filename, len + 10, MPI_CHAR, 0, MPI_COMM_WORLD);

    }

    buf = (int *) malloc(SIZE);

    nints = SIZE / sizeof(int);

    for (i = 0; i < nints; i++)

        buf[i] = rank * 100000 + i;

    /* each process opens a separate file called filename.'myrank' */

    tmp = (char *) malloc(len + 10);

    strcpy(tmp, filename);

    sprintf(filename, "%s.%d", tmp, rank);

    MPI_File_open(MPI_COMM_SELF, filename, MPI_MODE_CREATE | MPI_MODE_RDWR, MPI_INFO_NULL, &fh;;

    MPI_File_set_view(fh, 0, MPI_INT, MPI_INT, (char *) "native", MPI_INFO_NULL);

    for (i = 0; i < NUMOPS; i++) {

        MPI_File_iwrite(fh, buf, nints, MPI_INT, &(requests[i]));

    }

    MPI_Waitall(NUMOPS, requests, statuses);

    MPI_File_close(&fh;;

    /* reopen the file and read the data back */

    for (i = 0; i < nints; i++)

        buf[i] = 0;

    MPI_File_open(MPI_COMM_SELF, filename, MPI_MODE_CREATE | MPI_MODE_RDWR, MPI_INFO_NULL, &fh;;

    MPI_File_set_view(fh, 0, MPI_INT, MPI_INT, (char *) "native", MPI_INFO_NULL);

    for (i = 0; i < NUMOPS; i++) {

        MPI_File_iread(fh, buf, nints, MPI_INT, &(requests[i]));

    }

    MPI_Waitall(NUMOPS, requests, statuses);

    MPI_File_close(&fh;;

    /* check if the data read is correct */

    for (i = 0; i < nints; i++) {

        if (buf[i] != (rank * 100000 + i)) {

            errs++;

            fprintf(stderr, "Process %d: error, read %d, should be %d\n", rank, buf[i],

                    rank * 100000 + i);

        }

    }

    free(buf);

    free(filename);

    free(tmp);

    MTest_Finalize(errs);

    MPI_Finalize();

    return 0;

}